Add native shell launcher with themed search and browsing

shell/ferese-shell/src/launcher/work.rs

@@ -0,0 +1,15 @@
+use std::sync::{
+    Arc,
+    atomic::{AtomicBool, Ordering},
+};
+
+#[derive(Clone, Default, Debug)]
+pub(super) struct Cancellation(Arc<AtomicBool>);
+impl Cancellation {
+    pub(super) fn cancel(&self) {
+        self.0.store(true, Ordering::Relaxed);
+    }
+    pub(super) fn cancelled(&self) -> bool {
+        self.0.load(Ordering::Relaxed)
+    }
+}